Richard, Ochaya, Mary, or whomever. It helps us if you don't change names and you don't get any faster answers by us; in fact it may take us longer since we follow up on old posts before taking new ones. This problem is worked the same way as the other two I've shown you how to work (FeS2 problem and hydrogen problem). Post your work if you get stuck.

What, what?
Mary, Richard, and Ochaya posted similar questions, similarly quoted, and using the same kind of type, all withing a few posts of each other, and on the same computer. Many students change names because they think we won't answer if the same student posts too many questions but that isn't true. Here is a link to one of the posts that is quite similar to your with details about how to work it. Post your work if you have any trouble and we can help you through.
http://www.jiskha.com/display.cgi?id=1254155172

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